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Square is a parallelogram with right angles and equal sides (Fig.35). A square is a particular case of a rectangle and a rhombus simultaneously; so, it has all their above mentioned properties. Trapezoid is a quadrangle, two opposite sides of which are parallel (Fig.36).
The types of quadrilaterals can be classified by relationships of their sides and angles. Parallelogram: A four-sided polygon with two pairs of parallel and equal sides. The following is a parallelogram. Rectangle: A rectangle is a parallelogram with 4 right angles.